SOLUTION: Sandy's average for three tests is 84. What must she earn on the next test to raise her average to 88?

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Question 215199: Sandy's average for three tests is 84. What must she earn on the next test to raise her average to 88?
Answer by drj(1380) About Me  (Show Source):
You can put this solution on YOUR website!
Sandy's average for three tests is 84. What must she earn on the next test to raise her average to 88?

Step 1. Let x be the next score to average 88.

Step 2. Since the average is 84 for three tests, let's just say the scores be 84 for all three tests.

%2884%2B84%2B84%2Bx%29%2F4=88

252%2Bx=88%2A4=352

252%2Bx-252=352-252=100

x=100


Check...%2884%2B84%2B84%2B100%29%2F4=88 or 88=88 which is a true statement.

Step 3. The next test score is 100 to average 88.

I hope the above steps were helpful.

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Good luck in your studies!

Respectfully,
Dr J